[FIXED] Quiver/wind arrow plot in python

Issue

I am trying to make a plot showing the wind direction and wind speed as a vector (arrow) on a map.

I have a dataset which has the following structure (consisting of several lines):

lat lon winddirection(degrees) windspeed(kts)

52 -12 270 32
51 -13 271 33
.
.
.

I tried to use the quiver module, however, this seems to work with u/v components.

Does anyone know how I would make a plot showing the wind as arrows on a lat/lon 2D map?

Thanks,

Solution

You can use winddirection to compute u, v components like this:

import numpy as np
import pandas as pd

# load your dataframe into the variable df

u = df["windspeed"] * np.cos(np.radians(df["winddirection"]))
v = df["windspeed"] * np.sin(np.radians(df["winddirection"]))

Then you do:

import matplotlib.pyplot as plt
import matplotlib.cm as cm

plt.figure()
plt.quiver(df["lat"], df["lon"], u, v, df["windspeed"], cmap=cm.viridis)

Answered By - Davide_sd